DMZ262 - Senior .NET Developer

Our client is seeking experienced Senior .NET Developers to design, develop and enhance scalable, high-performance applications within a distributed microservices environment. The successful candidates will work extensively with .NET 8+, C# 12+, SQL Server, REST/gRPC APIs and event-driven architectures, while contributing to architecture decisions, technical leadership, production stability and continuous modernisation. The role requires strong engineering craftsmanship, performance optimisation and ownership within a fast-moving and regulated environment.

• Build, enhance and maintain scalable, high-performance applications using .NET 8+ and C# 12+ within distributed microservices architectures.
• Design and implement RESTful and gRPC APIs, ensuring appropriate documentation, backward compatibility and versioning standards.
• Develop event-driven services using RabbitMQ, Kafka or Azure Service Bus to support high-volume asynchronous workloads.
• Design and optimise SQL Server databases, queries, indexing and execution plans for high-throughput production environments.
• Implement advanced caching patterns using Redis and distributed caching, where applicable, to reduce latency and improve application performance.
• Drive code quality through rigorous code reviews, SOLID principles, design patterns, refactoring and established software engineering standards.
• Develop and maintain automated testing across unit, integration, contract and load-testing layers.
• Design and manage Azure DevOps CI/CD pipelines, release processes and modern deployment strategies including blue-green and canary deployments.
• Perform application profiling, debugging and performance optimisation while supporting logging, tracing and observability practices.
• Lead technical design discussions, contribute to architecture decisions and identify opportunities for system modernisation and performance improvements.
• Lead incident response, post-mortems and operational improvement activities for high-severity production issues.
• Mentor junior and mid-level developers while collaborating effectively with technical and cross-functional teams

• Strong technical leadership and ability to influence architecture without formal authority.
• Excellent technical communication and ability to explain complex concepts to diverse audiences.
• Strong ownership mindset with accountability for technical and operational outcomes.
• Advanced analytical, debugging and problem-solving capabilities.
• Ability to remain composed and provide leadership during high-severity production incidents.
• Adaptability within fast-moving environments and changing priorities.
• Strong collaborative and cross-functional communication capabilities.
• High attention to detail, particularly within regulated environments.
• Proactive, solution-driven and resilient approach to software engineering.

• Expert-level proficiency in .NET 8+ and C# 12+, including async/await, LINQ, reflection and performance tuning, is required.
• Strong experience with Dapper and/or EF Core, including ORM trade-offs and performance tuning, is required.
• Advanced SQL Server experience covering query tuning, indexing, execution plans and statistics is required.
• Strong microservices architecture experience, including service boundaries, communication patterns and reliability, is required.
• Experience with RabbitMQ, Kafka or Azure Service Bus and event-driven architecture is required.
• Strong experience designing REST and/or gRPC APIs, including backward compatibility and versioning, is required.
• Advanced Azure DevOps pipeline design and release management experience is required.
• Strong experience with automated testing across multiple testing layers is required.
• Strong knowledge of SOLID principles, design patterns and refactoring practices is required.
• Expert-level proficiency in .NET 8+ and C# 12+, including async/await, LINQ, reflection and performance tuning, is required.
• Strong experience with Dapper and/or EF Core, including ORM trade-offs and performance tuning, is required.
• Advanced SQL Server experience covering query tuning, indexing, execution plans and statistics is required.
• Strong microservices architecture experience, including service boundaries, communication patterns and reliability, is required.
• Experience with RabbitMQ, Kafka or Azure Service Bus and event-driven architecture is required.
• Strong experience designing REST and/or gRPC APIs, including backward compatibility and versioning, is required.
• Advanced Azure DevOps pipeline design and release management experience is required.
• Strong experience with automated testing across multiple testing layers is required.
• Strong knowledge of SOLID principles, design patterns and refactoring practices is required.

• Contract: 12 Months Renewable – Open to Permanent employment
• Location: Johannesburg
• Mode of Work: Hybrid – 4 days per week in the office